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Reaction of Montmorillonite with Iron(III)
Author(s) -
Herrera Rafael,
Peech Michael
Publication year - 1970
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1970.03615995003400050021x
Subject(s) - montmorillonite , chemistry , adsorption , monolayer , saturation (graph theory) , inorganic chemistry , cation exchange capacity , organic chemistry , geology , soil water , biochemistry , mathematics , combinatorics , soil science
The reaction between montmorillonite and Fe(III) was studied at two different degrees of neutralization of the FeCl 3 solutions. The adsorption of iron was found to reach a definite saturation value which depended on the initial degree of neutralization of the FeCl 3 . The maximum amount of Fe(III) adsorbed from FeCl 3 solution, having molar OH/Fe ratio = 2, corresponded to the calculated amount of Fe(III) required to form a complete monolayer of octahedrally coordinated Fe(III) on both planar surfaces of the moutmorillonite. The Fe(III)‐montmorillonite complex had a net positive charge at pH 5, which decreased with increase in pH; its cation exchange capacity, however, remained constant at about 45 meq/100 g within the pH range from5 to 7.